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I think we could still make this much simpler :D

I'm not sure if we even need a custom config format that needs parsing. If we do placeholder replacement, we can skip most of the parsing logic while supporting even more use cases.

Example

Template: shader.template

#version 330
uniform float template_local;
// PLACEHOLDER: unifs_code.snippet
void main() {
    // PLACEHOLDER: x_code.snippet
    // PLACEHOLDER: y_code.snippet
    gl_Position = move * vec4(x, y, 0.0, 1.0);
}

Snippet: unifs_code.snippet

uniform float value;

Snippet: x_code.snippet

float x = value + 1.0

Snippet: y_code.snippet

float y = value - 1.0

End result:

#version 330
uniform float template_local;
uniform float value;
void main() {
    float x = value + 1.0
    float y = value - 1.0
    gl_Position = move * vec4(x, y, 0.0, 1.0);
}